I am so disappointed with TransUnion

I logged a dispute with TransUnion with regard to wrongful listing by Maravedi Credit solutions, they asked for supporting documents as I have told them that my debts were under administration since 2012 to 2018 my account was handed over by Bradlows furniture to Maravedi Credit solutions. Now TransUnion insists that the attorneys paid up letters must be written account number instead of Ref numbers even though are the same digits as Bradlows furniture account numbers and the attorneys are saying that how Maravedi Credit solutions presented them to their file when they were communicating so they can't just change their legal terminology. So TransUnion cannot proceed with the investigation because of that excuse. In the meantime am stuck with the ridiculous amounts that are listed by Maravedi Credit solutions.